The luteal phase of the menstrual cycle is about the same length in most individuals (mean 14/13 days, SD 1.41 days) whereas the follicular phase tends to show much more variability (log-normally distributed with 95% of individuals having follicular phases between 10.3 and 16.3 days).he length of a woman's menstrual cycle typically varies somewhat, with some shorter cycles and some longer cycles. A woman who experiences variations of less than eight days between her longest cycles and shortest cycles is considered to have regular menstrual cycles.
Iambic pentameter is a commonly used type of metrical line in traditional English poetry and verse drama. The term describes the rhythm that the words establish in that line, which is measured in small groups of syllables called  feet . line of iambic pentameter is made up of five such pairs of short/long, or unstressed/stressed, syllables. Iambic rhythms come relatively naturally in English.
An iamb is the term used for the most common metrical foot in English poetry, short stress followed by long, ti-tum. Five iambs in one line together comprise in turn the commonest pattern in English verse. Webster only departs from the verse of iambic pentameter when he strays, rarely, into prose.